This late 17th century Scottish analemmatic double sundial is among the highlights going under the hammer at Flints Auctions in Stoke Newington, London, on October 31-November 1.
Designed for a latitude that runs from Dundee in the east to north Argyll in the west, the 5 x 8in (13 x 20cm) dial comes complete in its original velvet-lined sharkskin case and with an antique manuscript page of instructions copied from Edmund Stone’s 1758 English translation of Nicholas Bion’s famous book, Construction and Principal Uses of Mathematical Instruments. Estimate £1800-2500.